CRANK ANGLE AND CYLINDER DECIDING METHOD FOR INTERNAL COMBUSTION ENGINE

摘要

PURPOSE:To simplify patterning of a decision reference and to perform constantly accurate and rapid decision of a crank angle and a cylinder, in a system to decide a crank angle and a cylinder by means of a signal from a single rotation sensor. CONSTITUTION:Three protrusions 22, 23, and 24 for deciding a crank angle are formed at unequal intervals on a disc 21 of a rotation sensor 20 mounted on a cam shaft 7 of an engine body 1, and a single protrusion 25 for deciding a cylinder is formed on a first cylinder to generate a plurality of signals at unequal intervals. A plurality of the signals are checked for the arrangement state of a pulse distance therebetween by a CPU 34 of a control unit 30. A crank angle is decided at a point of time when a given arrangement pattern is detected by means of only a pulse for deciding a crank angle, and a cylinder is decided at a point of time when a given arrangement pattern containing a pulse for deciding a cylinder is detected and at a point of time when a change in a given pulse distance is detected in the spot of a pulse for deciding a cylinder.